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Finding the Fourth Proportional to 551.79, 761.48 and 330.75

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Solution

The fourth proportional to 551.79, 761.48 and 330.75 is: 456.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.79 : 761.48 = 330.75 : x
  2. Step 2: Convert to fraction form
    551.79/761.48 = 330.75/x
  3. Step 3: Cross multiply
    551.79x = 761.48 × 330.75
  4. Step 4: Simplify right side
    551.79x = 251,859.51
  5. Step 5: Solve for x
    x = 251,859.51/551.79
  6. Step 6: Final answer
    x = 456.44

Related Problems

Find fourth proportional to 275.90, 380.74 and 165.38
Half scale
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Double scale
Find fourth proportional to 552.79, 762.86 and 331.75
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.